Shock absorber



April 2, 1935. v

A. HOLMSTROM SHOCK ABSORBER Filed Sept. 28, 1933 2 Sheets-Sheet 1 INVENTOR.

fllyusf /%/m /r'om. 7 M I ATTORNEY April 2, 1935. A. HOLM'STROM SHOCK ABSORBER Filed se bt. 28, 1953' 2 Sheets-Sheet 2 ATTORNEY Q 30 Figure 3 is atransverse sectional view of the I EoFF fsi ees sseaem i i m' s qa cus nrsg- I r v AD'hlic gtion Se tember 284933, esame; 691,376]

This invention relates to shock absorbers of a inwardly fro'm one end, as at 25, and count --1 yieldable type, as used for vehicle springs, and bored centrally as at 26, the bore receiving arigid more particularly to shockabsorbers of the hy stud 2! and a counterbore an enlarged shoulder n v draulic type having an automatically acting presportion 28 of the lever arm 2|. I sure control. I I A packing screw 29 is fitted to the outer end 5 One of the objects of the invention is to proof the bore 25 to pr v a t t J' t for the' vide a shock absorbing'structure in which liquid 7 spindl th ut d 30 f'w h s rru at d is compressed by the movement of the springs, f as clearly shown and fitted to it is a hub 3| proproducing a cushioning effect upon'both the videdwith corresponding corrugations and-split l0 bound and rebound of the vehicle springs.- atone side to p DV de 32 p d by a bolt t t A further feature is in the provision of a shock 3 thereby providing .an effective non-sl p C011- absorber composed of simple parts capable of nection between the hub and Sp n long continued use and whichare unobtrusive in I Extending from the hub 3| in a having appearance, I right angle offset arm 39 terminating in a Another purpose is to produce a shock absorber Sphere 4|} adapted to be e g between t o 1 in which themoving parts are protected from enhalves of a connecting link 4|, provided withentry of dust or gritty particles which might tend lar dh ads 42 nta g a sph ri alrec ss t v to wear the moving surfaces and produce leaky receive the Sphere d t the other end with a t I similar enlarged head 43, which may also be I These Several bjects are tt n d byi the novel 1 spherical recessed for connection with the spring 20 construction and combination of few an'd simple other elements. the v ent Of which the parts as hereinafter described and shown in the Structure i d p to absorb, it being under-' accompanying drawings, forming a material part stood that the two portions 4| of the connecting of this disclosureand in w11ich; 'link are held togetheras by the bOltS 44;

Figure 1 is'a top. plan view showing an embodiment of the invention, parts being broken away to disclose its construction. a I

Figure 2 is a longitudinal sectional view taken on line 2-2 of Figure 1.

that thepiston I1 is provided with .two bores 45- 46 ofiset, equally from the center and arranged in parallel planes, one of the passages as 45, being" open at one end while the other passage is open at the opposite end of the piston.

These open ends are enlarged and provided with screw caps 41-48 at the respective'ends which contain central passages- 4950. I I

piston and drawn to an enlarged scale, taken on line 3-3 of Fig. 5. s I I H Figure 4 is a transverse sectional view taken on line 4-4 of Figure 2. a I

I ct'onal view taken v v i ig gigig' g fiz Se simillarlyargyided 311th vent opengiggsffil-SZ, aiig I reeysia ein eopemngs art-3801"; 65 231,2 2 gigilsra sgrmilar sectional view talien on line g? ga zi sg i vq i e i ggg out v 0 ar re a Attached either vertically or horizontally to gi g Screw -s Wm some part of the chassis frame, as a channel bar The Valves adapted cover ports ln are the flanges ll of a casing 12,.general1y Starting near'the Screws 41; at their cylindrical, and provided at one end with screw inner ends and completely open attheif.

threads to engage a cap I3 having a packing outer ends, as clearly shown; 1

Returning now tothe piston I1 and by refer}- 25 v ence to- Figures 3 to; 6 inclusive, it will be seen I i The opposite end of the openings -46 are 35.

45 element '4, 170 Contact the Open end Of the Cyl- I now be understood upon mu em t s inder opposite its closed end IS; the casing cono the connecting dements 4| t g 111 I tains a'cylindrical bore IE to which is fitteda pmducedinithe lever 33 n tr n tt by jt p s I? hav a r v ly narrow centra to the lever terminating in the element 20; causcess l8, bevelled at its entering edges l9. ingthe piston I? to move onedirection 'or 50, Fitted closely within the recess I8 isthe partit other, t v t however, being 11511- i circular head 20 of an a m 2| p j g ou ioned by liquid contained in-the bore of 'the wardly through an Out n n r l ug 22 cylinder 2 and having a compression'effechz I formed on the casing l2, and provided with a cap causing. the liquid to enter the openings 49-50, t 23 held by bolts. 24. 'jmovin'g the valves 53-54and permitting theex- The lug member 22 and its cap 23 are bored cesspressure' to be released by the ports51-58, 55

it being understood that immediately the excess pressure has been released, the valve will close the opening and this is true of the device in whichever direction the piston may move. In addition an inlet 50, is provided in each cylinder end closed by a screw to prevent the entrance of air and dust, while the removal of the screw will allow the introduction of the hydraulic means. 7

The shock absorber-can eitherbe mounted vertically or LhOIiZOIItQDYVOD. the chassis as the situation requires.

Having thus described the invention what is claimed as new and sought to secure by Letters Patent 'is:

In a hydraulic shock absorber for vehicle springs, a casing adapted to be secured to the frame of the vehicle and having a' longitudinally extending cylindrical bore closed at its ends, a

piston operative in said bore, shock operated means to move said piston in either direction, said piston having two bores equally offset from its center and arranged in parallel planes, said piston bores being open at opposite ends of the piston, screw caps closing the open ends of said bores and containing central passages, solid piston valves freely slidable in said bores, said piston having two ports, one of said ports communicating between one of said piston bores and one side of said casing bore, the other. of said ports communicating between the other of said piston ports and the other side of said casing bore, and springs for forcing said valves outwardly to permit any excess of pressure to be released by said piston ports, said valves closing the passages in said screw caps for absorbing the shocks experienced by said piston.

AUGUST HOLMSTROM. 

